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Message-ID: <OFB812AC35.7E514449-ONC125727C.0029AA85-C125727C.002B65DA@ra.rockwell.com> Date: Thu, 8 Feb 2007 08:55:01 +0100 From: Milan Svoboda <msvoboda@...rockwell.com> To: Thomas Gleixner <tglx@...utronix.de> Cc: linux-kernel@...r.kernel.org Subject: Re: posix-timers overrun broken? > On Wed, 2007-02-07 at 14:36 +0100, Milan Svoboda wrote: > > But if the next interrupt arrives before function collect_signal is called > > to actually deliver the > > siginfo_t to userspace, the si.overrun is cleared in posix_timer_event and > > we have just forgotten > > one overrun... > > > > Am I wrong? > > Yes. posix_timer_event() is only called when the timer expires the first > time. When the signal has been queued, the timer is not rearmed and the > overrun is calculated in the actual signal delivery path, which calls > do_schedule_next_timer(). Ok understand. So it seems to me that drivers/char/mmtimer.c is wrong. It is driver to additional hardware timers and mmtimer exports them as a posix timer. When interrupt happens, they call posix_timer_event and set hardware interrupt to the next tick. I use the same practise in my driver and found that overruns are reported wrongly. How to plug "external" source of ticks to the posix timers? As far as I know current HRT doesn't allow us to use more sources of ticks together, only one is selected, correct? Milan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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